Rockwell Automation 20D-P2-DG03 DriveGuard Safe Torque Off Option for PowerFlex 700S Phase II and 700L Drives - Manual (Page 7)

Rockwell Automation Publication 20D-UM007G-EN-P - March 2012 7
Chapter
1
General Description
The DriveGuard Safe Torque Off option, when used with other safety
components, helps provide protection to meet the requirements for SIL CL2
and Category 3 or PL d class applications. Safety requirements are based on
the standards current at the time of certification.
The DriveGuard Safe Torque Off option is just one component in a safety
control system. Components in the system must be chosen and applied
appropriately to achieve the desired level of operator safeguarding.
What Is the DriveGuard Safe Torque Off Option?
The DriveGuard Safe Torque Off option:
• Is designed to help safely remove power from the gate firing circuits of the
drive’s output power devices (IGBT’s). This helps prevent the drive’s
output power devices from switching in the pattern necessary to generate
rotation at the motor.
• Can be used in combination with other safety devices to satisfy the Safe
Torque Off requirements of SIL CL2, according to EN 61800-5-2,
IEC 61508, and EN 62061 Performance Level PL d and Category 3
according to EN ISO 13849-1.
IMPORTANT This option is suitable for performing mechanical work on the drive
system or affected area of a machine only. It does not provide
electrical safety. For electrical maintenance on the drive and/or motor,
equipment must be electrically disconnected from the power source.
The Safe Torque Off option should not be used for non safety-related
stopping of the drive.